I was using all lowercase as my default for internet comments (and personal journal entries) for at least a solid decade, starting from some point in the 90s. I saw it as a way to take a step back from being pretentious.

I eventually ran into so much resistance and hate about it that I decided conforming to writing in a way that people aren't actively hostile to was a better approach to communicating my thoughts than getting hung up on an aesthetic choice.

Having started out as a counterculture type, that will always be in my blood, but I've relearned this lesson over and over again in many situations-- it's usually better to focus on clear communication and getting things done unless your non-standard format is a critical part of whatever message you're trying to send at the moment.

I'm a big fan of counter culture and so on, but generally the point of text is to be read and using all lower case just makes it harder for all your readers, which seems like the worst form of arrogance.